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Open AccessArticle

Treatment of Actual Chemical Wastewater by a Heterogeneous Fenton Process Using Natural Pyrite

State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
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Academic Editors: Rao Bhamidiammarri and Kiran Tota-Maharaj
Int. J. Environ. Res. Public Health 2015, 12(11), 13762-13778; https://doi.org/10.3390/ijerph121113762
Received: 14 September 2015 / Revised: 18 October 2015 / Accepted: 20 October 2015 / Published: 28 October 2015
(This article belongs to the Special Issue Environmental Systems Engineering)
Wastewater from chemical plants has remarkable antibiotic effects on the microorganisms in traditional biological treatment processes. An enhanced Fenton system catalyzed by natural pyrite was developed to degrade this kind of wastewater. Approximately 30% chemical oxygen demand (COD) was removed within 120 min when 50 mmol/L H2O2 and 10 g/L natural pyrite were used at initial pH from 1.8 to 7. A BOD5/COD enhancement efficiency of 210% and an acute biotoxicity removal efficiency of 84% were achieved. The COD removal efficiency was less sensitive to initial pH than was the classic Fenton process. Excessive amounts of pyrite and H2O2 did not negatively affect the pyrite Fenton system. The amount of aniline generated indicated that nitrobenzene reduction by pyrite was promoted using a low initial concentration of H2O2 (<5 mmol/L). Fluorescence excitation emission matrix analyses illustrated that H2O2 facilitated the reduction by natural pyrite of organic molecules containing an electron-withdrawing group to electron-donating group. Thus, the Fenton-like process catalyzed by pyrite can remediate wastewater containing organic pollutants under mild reaction conditions and provide an alternative environmentally friendly method by which to reuse natural pyrite. View Full-Text
Keywords: natural pyrite; heterogeneous Fenton process; chemical wastewater; reduction natural pyrite; heterogeneous Fenton process; chemical wastewater; reduction
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Sun, L.; Li, Y.; Li, A. Treatment of Actual Chemical Wastewater by a Heterogeneous Fenton Process Using Natural Pyrite. Int. J. Environ. Res. Public Health 2015, 12, 13762-13778.

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